Bug 689962
| Summary: | [Ironlake LVDS Vaio-Y i915] Backlight controls ineffective | ||||||||||||||||||||||||
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| Product: | [Fedora] Fedora | Reporter: | Michel Lind <michel> | ||||||||||||||||||||||
| Component: | kernel | Assignee: | John Feeney <jfeeney> | ||||||||||||||||||||||
| Status: | CLOSED CURRENTRELEASE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> | ||||||||||||||||||||||
| Severity: | medium | Docs Contact: | |||||||||||||||||||||||
| Priority: | unspecified | ||||||||||||||||||||||||
| Version: | 15 | CC: | gansalmon, itamar, jonathan, kernel-maint, madhu.chinakonda | ||||||||||||||||||||||
| Target Milestone: | --- | ||||||||||||||||||||||||
| Target Release: | --- | ||||||||||||||||||||||||
| Hardware: | x86_64 | ||||||||||||||||||||||||
| OS: | Linux | ||||||||||||||||||||||||
| URL: | http://www.smolts.org/client/show/pub_c56830aa-111c-4398-9cad-96c821d2ad84 | ||||||||||||||||||||||||
| Whiteboard: | |||||||||||||||||||||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||||||||||||||||||||
| Doc Text: | Story Points: | --- | |||||||||||||||||||||||
| Clone Of: | Environment: | ||||||||||||||||||||||||
| Last Closed: | 2011-11-24 13:36:36 UTC | Type: | --- | ||||||||||||||||||||||
| Regression: | --- | Mount Type: | --- | ||||||||||||||||||||||
| Documentation: | --- | CRM: | |||||||||||||||||||||||
| Verified Versions: | Category: | --- | |||||||||||||||||||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||||||||||||||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||||||||||||||||||
| Embargoed: | |||||||||||||||||||||||||
| Attachments: |
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Description
Michel Lind
2011-03-22 21:18:37 UTC
Created attachment 486898 [details]
lspci -s 00:02.0 -xxx
Created attachment 486899 [details]
sysfs hierarchy
Created attachment 486900 [details]
ACPI dump
Created attachment 486901 [details]
intel register dump
Created attachment 486902 [details]
dmesg
Assigning to Matthew Garrett, per #fedora-kernel discussion Created attachment 486909 [details]
lspci -vv (as root)
note: I consistently get an error message while running this:
pcilib: sysfs_read_vpd: read failed: Connection timed out
Created attachment 486910 [details]
lspci -s 00:02.0 -xxx (as root)
Hi Matthew -- did you get a chance to look at this? Thanks. Is this a duplicate of bug 702911 ? Not quite; in that bug, no backlight control is presented, whereas in my case acpi_video0 is present in /sys/class/backlight but non functional. setpci -s 00:02.0 F4.B=[two-digit-hex-value] does not work either; on using lspci to read the value back, it always returns 0. I've tried using acpi_backlight=vendor -- in which case, sony-laptop is present instead of acpi_video0, but backlight is stuck to -1 regardless of what value I attempt to assign it (whereas with acpi_video0, it appears to take the new value, as shown in actual_brightness) The problem is very similar to that reported on the forum for a Lenovo, so it's not a Sony-only problem. http://forums.fedoraforum.org/showthread.php?t=258868 Created attachment 509966 [details]
Decoded DSDT as dumped using acpidump and decoded using iasl
ah, I mean /sys/classes/backlight/sony -- not sony-laptop. If I boot with sony-laptop.debug=1, and attempt to adjust brightness via Fn-keys, I get the following in dmesg: [22361.949175] sony_laptop: found handle 0x0100 (offset: 0x00) [22361.949186] sony_laptop: handle 0x0127 not found [22361.949193] sony_laptop: found handle 0x0100 (offset: 0x00) [22361.956004] sony_laptop: called SN07 with 0x0200 (result: 0x0286) [22361.956217] sony_laptop: sony_nc_notify, event: 0x11 [22361.983875] [drm:intel_crtc_cursor_set], [22362.042725] sony_laptop: found handle 0x0100 (offset: 0x00) [22362.042730] sony_laptop: handle 0x0127 not found [22362.042734] sony_laptop: found handle 0x0100 (offset: 0x00) [22362.049667] sony_laptop: called SN07 with 0x0200 (result: 0x0206) [22362.049672] sony_laptop: sony_nc_notify, event: 0x3b but not if I manipulate the brightness via /sys/classes/backlight/sony/brightness. That interface behaves almost identicallly to /sys/classes/backlight/acpi_video0 (except that actual_brightness is stuck at -1 instead of pretending to agree with what's written to brightness), but max_brightness is 7 instead of 8. I've tried the latest Rawhide kernel -- kernel-3.0-0.rc4.git3.1.fc16.x86_64 -- and the problem is still present. Should we make a tracking bug for all i915 backlight problems? The bugs seem different enough that they shouldn't be merged into one, but similar enough that we might want an easy-to-collate set to bring up with the Intel driver developers. Created attachment 512658 [details]
mjg's i915 native GPU backlight control patch from linux-next
Applying Matthew Garrett's latest iteration of the i915 native backlight patch, already in linux-next, on top of Linus' 3.0rc7 fixes the issue for me.
Is this patch slated to be pulled into 3.0rc8? Hopefully it will be backported to F15, or F15 gets a 3.0 kernel update.
(In reply to comment #14) > Created attachment 512658 [details] > mjg's i915 native GPU backlight control patch from linux-next > > Applying Matthew Garrett's latest iteration of the i915 native backlight patch, > already in linux-next, on top of Linus' 3.0rc7 fixes the issue for me. > > Is this patch slated to be pulled into 3.0rc8? Hopefully it will be backported > to F15, or F15 gets a 3.0 kernel update. F15 is on 2.6.40 now, which is just a renamed 3.0. Your comment indicates this particular bug should be resolved. Is that the case? Not in 2.6.40/3.0, but the patch was finally committed in time for 2.6.41/3.1. Sadly the laptop in question is now on Fedora 16, but I think we can close this bug. |