User-Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:80.0) Gecko/20100101 Firefox/80.0 Build Identifier: When booting any 5.8 kernel so far, screen brightness is always at the absolute maximum, and no method of controlling the brightness has any effect. All still works properly when booting to last kernel prior to 5.8, 5.7.17. Reproducible: Always Steps to Reproduce: 1. Boot system using one of the 5.8 kernels Actual Results: during boot screen brightness goes to maximum, and no method of controlling brightness has any effect. Expected Results: screen brightness remains at previously set level, and can be successfully adjusted with various methods, whether in the GUI or CLI. System is a late 2012 iMac. Graphics controller info from lspci: VGA compatible controller: NVIDIA Corporation GK107M [GeForce GT 640M Mac Edition] (rev a1) (prog-if 00 [VGA controller]) Using nouveau driver, but also tried proprietary NVIDIA driver and the problem remained.
I've learned that if I suspend system, then bring it out of suspend, brightness control works as expected until the next reboot.
I'm not sure if I should comment on this bug, or file a new one. I'm using Intel Iris Graphics G7, and could not control the brightness. The brightness was always set to the maximum. I could use the function keys on my laptop (identified below), but - while the OSD came up to show it was supposed to be turning the brightness up or down - nothing happened. I fixed the situation by adding "i915.enable_dpcd_backlight=1" to the end of GRUB_COMMANDLINE_LINUX in /etc/default/grub. This line is (I'm assuming) specific to Intel graphics, so I don't think it would help the OP. However, if this is the fix for any graphics card, perhaps this should be added to the logic when constructing that line during install.
Sorry! Forgot to add my system details. HP Spector x360 13-aw0xxx $ lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation Iris Plus Graphics G7 (rev 07) $ uname -a Linux rhesus 5.10.7-200.fc33.x86_64 #1 SMP Tue Jan 12 20:20:11 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux $ cat /etc/fedora-release Fedora release 33 (Thirty Three) System is up to date.
Same problem for me. I'm on a fresh installation of fedora 33 on a 27" late2013 Imac. The problem is the same, it is impossible for me to adjust the screen brightness using the slider in the Gnome menu, nor in the energy settings. Screen brightness is always at the absolute maximum. Setting the automatic brightness to 1 doesn't change anything. After adjust the brightness directly on /sys/class/backlight/acpi_video0 with the command : echo 7 > /sys/class/backlight/acpi_video0/brightness Nothing changes, even with other values. In the /sys/class/backlight folder, I only have acpi_video0. However, I have tried to change the settings at Grub startup : acpi_backlight=vendor, acpi_backlight=video,acpi_backlight=none, and acpi_backlight=native, but without success, the slider in the gnome menu disappears for (vendor, native and none). The problem is the same with nvidia or nouveau. [laurent@localhost ~]$ uname -a Linux localhost.localdomain 5.10.11-200.fc33.x86_64 #1 SMP Wed Jan 27 20:21:22 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux I have the same problem with an install Ubuntu 20.04.2 with the kernel 5.8.0-41-generic (HWE). When I come back to kernel 5.4.0-65-generic, I can change the brightness again. [laurent@localhost ~]$ lspci 00:00.0 Host bridge: Intel Corporation 4th Gen Core Processor DRAM Controller (rev 06) 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller (rev 06) 00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 05) 00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 (rev 04) 00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 05) 00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 (rev d5) 00:1c.2 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #3 (rev d5) 00:1c.3 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #4 (rev d5) 00:1c.4 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #5 (rev d5) 00:1f.0 ISA bridge: Intel Corporation Z87 Express LPC Controller (rev 05) 00:1f.2 SATA controller: Intel Corporation 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] (rev 05) 00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller (rev 05) 01:00.0 VGA compatible controller: NVIDIA Corporation GK107M [GeForce GT 755M Mac Edition] (rev a1) 01:00.1 Audio device: NVIDIA Corporation GK107 HDMI Audio Controller (rev a1) 03:00.0 Network controller: Broadcom Inc. and subsidiaries BCM4360 802.11ac Wireless Network Adapter (rev 03) 04:00.0 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme BCM57766 Gigabit Ethernet PCIe (rev 01) 04:00.1 SD Host controller: Broadcom Inc. and subsidiaries BCM57765/57785 SDXC/MMC Card Reader (rev 01) 05:00.0 PCI bridge: Intel Corporation DSL3510 Thunderbolt Controller [Cactus Ridge 4C 2012] (rev 03) 06:00.0 PCI bridge: Intel Corporation DSL3510 Thunderbolt Controller [Cactus Ridge 4C 2012] (rev 03) 06:03.0 PCI bridge: Intel Corporation DSL3510 Thunderbolt Controller [Cactus Ridge 4C 2012] (rev 03) 06:04.0 PCI bridge: Intel Corporation DSL3510 Thunderbolt Controller [Cactus Ridge 4C 2012] (rev 03) 06:05.0 PCI bridge: Intel Corporation DSL3510 Thunderbolt Controller [Cactus Ridge 4C 2012] (rev 03) 06:06.0 PCI bridge: Intel Corporation DSL3510 Thunderbolt Controller [Cactus Ridge 4C 2012] (rev 03) 07:00.0 System peripheral: Intel Corporation DSL3510 Thunderbolt Controller [Cactus Ridge 4C 2012] (rev 03) [laurent@localhost ~]$ lsmod Module Size Used by rfcomm 90112 4 nft_objref 16384 1 nf_conntrack_netbios_ns 16384 1 nf_conntrack_broadcast 16384 1 nf_conntrack_netbios_ns nft_fib_inet 16384 1 nft_fib_ipv4 16384 1 nft_fib_inet nft_fib_ipv6 16384 1 nft_fib_inet nft_fib 16384 3 nft_fib_ipv6,nft_fib_ipv4,nft_fib_inet nft_reject_inet 16384 4 nf_reject_ipv4 16384 1 nft_reject_inet nf_reject_ipv6 20480 1 nft_reject_inet nft_reject 16384 1 nft_reject_inet nft_ct 20480 15 nft_chain_nat 16384 4 ip6table_nat 16384 0 ip6table_mangle 16384 0 ip6table_raw 16384 0 ip6table_security 16384 0 iptable_nat 16384 0 nf_nat 49152 3 ip6table_nat,nft_chain_nat,iptable_nat nf_conntrack 163840 4 nf_nat,nft_ct,nf_conntrack_netbios_ns,nf_conntrack_broadcast nf_defrag_ipv6 24576 1 nf_conntrack nf_defrag_ipv4 16384 1 nf_conntrack iptable_mangle 16384 0 iptable_raw 16384 0 iptable_security 16384 0 ip_set 57344 0 nf_tables 241664 214 nft_ct,nft_reject_inet,nft_fib_ipv6,nft_objref,nft_fib_ipv4,nft_chain_nat,nft_reject,nft_fib,nft_fib_inet nfnetlink 16384 3 nf_tables,ip_set ip6table_filter 16384 0 ip6_tables 32768 5 ip6table_filter,ip6table_raw,ip6table_nat,ip6table_mangle,ip6table_security iptable_filter 16384 0 cmac 16384 3 bnep 28672 2 sunrpc 655360 1 nvidia_drm 65536 3 nvidia_modeset 1232896 5 nvidia_drm nls_utf8 16384 1 hfsplus 122880 1 snd_hda_codec_cirrus 24576 1 snd_hda_codec_generic 98304 1 snd_hda_codec_cirrus uvcvideo 114688 0 ledtrig_audio 16384 1 snd_hda_codec_generic videobuf2_vmalloc 20480 1 uvcvideo btusb 65536 0 btrtl 24576 1 btusb snd_hda_codec_hdmi 73728 1 btbcm 20480 1 btusb btintel 32768 1 btusb intel_rapl_msr 20480 0 intel_rapl_common 28672 1 intel_rapl_msr bluetooth 692224 33 btrtl,btintel,btbcm,bnep,btusb,rfcomm snd_hda_intel 57344 6 snd_intel_dspcfg 24576 1 snd_hda_intel soundwire_intel 45056 1 snd_intel_dspcfg videobuf2_memops 20480 1 videobuf2_vmalloc videobuf2_v4l2 36864 1 uvcvideo videobuf2_common 65536 2 videobuf2_v4l2,uvcvideo iTCO_wdt 16384 0 soundwire_generic_allocation 16384 1 soundwire_intel x86_pkg_temp_thermal 20480 0 intel_powerclamp 20480 0 videodev 294912 3 videobuf2_v4l2,uvcvideo,videobuf2_common mc 61440 4 videodev,videobuf2_v4l2,uvcvideo,videobuf2_common snd_soc_core 323584 1 soundwire_intel intel_pmc_bxt 16384 1 iTCO_wdt coretemp 20480 0 iTCO_vendor_support 16384 1 iTCO_wdt mei_hdcp 24576 0 ecdh_generic 16384 2 bluetooth at24 24576 0 snd_compress 32768 1 snd_soc_core kvm_intel 327680 0 ecc 36864 1 ecdh_generic snd_pcm_dmaengine 16384 1 snd_soc_core soundwire_cadence 36864 1 soundwire_intel snd_hda_codec 172032 4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_cirrus kvm 909312 1 kvm_intel apple_mfi_fastcharge 20480 0 snd_hda_core 110592 5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_hda_codec_cirrus ac97_bus 16384 1 snd_soc_core wl 6471680 0 irqbypass 16384 1 kvm joydev 28672 0 nvidia 34136064 184 nvidia_modeset rapl 20480 0 snd_hwdep 16384 1 snd_hda_codec snd_seq 86016 0 applesmc 24576 0 snd_seq_device 16384 1 snd_seq snd_pcm 131072 8 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,soundwire_intel,snd_compress,snd_soc_core,snd_hda_core,snd_pcm_dmaengine snd_timer 49152 2 snd_seq,snd_pcm intel_cstate 20480 0 cfg80211 954368 1 wl intel_uncore 176128 0 snd 110592 23 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_timer,snd_compress,snd_soc_core,snd_pcm usblp 28672 0 drm_kms_helper 274432 1 nvidia_drm soundcore 16384 1 snd rfkill 28672 6 bluetooth,cfg80211 thunderbolt 290816 0 i2c_i801 32768 0 mei_me 45056 1 mei 139264 3 mei_hdcp,mei_me acpi_als 20480 0 apple_bl 20480 0 kfifo_buf 16384 1 acpi_als i2c_smbus 20480 1 i2c_i801 lpc_ich 28672 0 industrialio 94208 2 acpi_als,kfifo_buf pcspkr 16384 0 cec 61440 1 drm_kms_helper drm 618496 6 drm_kms_helper,nvidia_drm zram 28672 1 ip_tables 28672 5 iptable_filter,iptable_security,iptable_raw,iptable_nat,iptable_mangle crct10dif_pclmul 16384 1 crc32_pclmul 16384 0 crc32c_intel 24576 5 sdhci_pci 65536 0 ghash_clmulni_intel 16384 0 cqhci 32768 1 sdhci_pci tg3 188416 0 sdhci 77824 1 sdhci_pci mmc_core 188416 3 sdhci,cqhci,sdhci_pci uas 32768 3 usb_storage 81920 2 uas video 53248 0 fuse 163840 3 [laurent@localhost ~]$ inxi -Fxz 12System: 12Kernel 5.10.11-200.fc33.x86_64 x86_64 12bits 64 12compiler gcc 12v 2.35-18.fc33) 12Desktop GNOME 3.38.3 12Distro Fedora release 33 (Thirty Three) 12Machine: 12Type Desktop 12System Apple 12product iMac14,2 12v 1.0 12serial <filter> 12Mobo Apple 12model Mac-27ADBB7B4CEE8E61 12v iMac14,2 12serial <filter> 12UEFI Apple 12v 143.0.0.0.0 12date 04/12/2020 12CPU: 12Info Quad Core 12model Intel Core i5-4570 12bits 64 12type MCP 12arch Haswell 12rev 3 12L2 cache 6144 KiB 12flags avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx 12bogomips 25542 12Speed 1023 MHz 12min/max 800/3600 MHz 12Core speeds (MHz) 121 1193 122 1196 123 857 124 1720 12Graphics: 12Device-1 NVIDIA GK107M [GeForce GT 755M Mac Edition] 12vendor Apple 12driver nvidia 12v 460.39 12bus ID 01:00.0 12Device-2 Apple FaceTime HD Camera (Built-in) 12type USB 12driver uvcvideo 12bus ID 1-7:4 12Display x11 12server Fedora Project X.org 1.20.10 12driver nvidia 12unloaded fbdev,modesetting,nouveau,vesa 12resolution 2560x1440~60Hz 12OpenGL 12renderer GeForce GT 755M/PCIe/SSE2 12v 4.6.0 NVIDIA 460.39 12direct render Yes [laurent@localhost ~]$ cat /etc/X11/xorg.conf cat: /etc/X11/xorg.conf: Aucun fichier ou dossier de ce type
same things after upgrade to 5.10.12-200.fc33.x86_64 (testing). But i confirm that I can adjust the brightness again after a sleep mode.
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Fedora 32 changed to end-of-life (EOL) status on 2021-05-25. Fedora 32 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.