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Created attachment 478899 [details] lspci -vv -nn -d 10de:0a29 Description of problem: On boot with updated Rawhide on Samsung R590 laptop (Nvidea GM330) /sys/class/backlight/nv_backlight/max_brightness is set to 1073864551 The brightness is fine for viewing and controllable via keys. If power cable is connected suspend/resume is ok and the brightness consistent. However, when on battery power a resume comes back with a very dim display and max_brightness is set to 1025. Keys work for adjusting brightness but do not get more than very dim. Attempting to exceed the now lower max_value results in: echo 1026 > /sys/class/backlight/nv_backlight/brightness -bash: echo: write error: Invalid argument (attempted writing large value to max_brightness results in permission denied) Version-Release number of selected component (if applicable): kernel-2.6.38-0.rc4.git0.2.fc15.x86_64 xorg-x11-drv-nouveau-0.0.16-18.20110117git38e8809.fc15.x86_64 How reproducible: Always. Steps to Reproduce: 1. Boot, login. 2. Note /sys/class/backlight/nv_backlight/max_brightness is 1073864551. 3. Run on battery and suspend/resume. Note dimmed display and changed max_brightness value. Actual results: Display is dim. Brightness keys go to max but display is still too dark to use. /sys/class/backlight/nv_backlight/max_brightness is set to 1025 Expected results: Brightness returns to normal levels. Additional info: Possibly related to https://bugzilla.redhat.com/show_bug.cgi?id=625171 In which case it is the initial max_brightness value is incorrect (but which works).
Created attachment 478900 [details] /var/log/messages excerpt after issue
Created attachment 478901 [details] Xorg log
This has been fixed with latest updates. 2.6.38-0.rc5.git1.1.fc15.x86_64 /sys/class/backlight/acpi_video0/max_brightness is now 7 Removing power dims the screen but using keyboard it can be increased to 7. /sys/class/backlight/nv_backlight is no longer present.