Created attachment 28752 [details] xorg config Since somewhere end june mid july. I dont recall exactly... The GIT radeonhd driver does have an issue with the buildin PANEL LVDS on Lenovo T60P. I'm now using the other ati driver in place of my preferred radeonhd... Even coming back to the text console and playing with the contrast does not help.
Created attachment 28753 [details] xorg log
Only wierd thing I can see in the log is the following: (II) RADEONHD(0): LVDSSetBacklight: trying to set BL_MOD_LEVEL to: 0 Changing the backlight to something else manually does NOT help
I've forget to say. Setting up manually BACKLIGHT via xrandr does not do anything. The value get changed, the light does not...
Can you try and bisect which commit this started from? The latest backlight-related commits are 1ff8649877a8d75b and de3f80bc6ec2adaab which were made on June 30th.
I'm back from few days of vacation. kroupouk xf86-video-radeonhd # git bisect good You need to start by "git bisect start" Do you want me to do it for you [Y/n]? y kroupouk xf86-video-radeonhd # git bisect bad 1ff8649877a8d75b fatal: Needed a single revision Bad rev input: 1ff8649877a8d75b I can't find theses commits in the log kroupouk xf86-video-radeonhd # git log > /tmp/brol.txt kroupouk xf86-video-radeonhd # grep 1ff8649877a8d75b /tmp/brol.txt kroupouk xf86-video-radeonhd # grep de3f80bc6ec2adaab /tmp/brol.txt I'm not very fluent with GIT, I guess I do a mistake somewhere. Any help?
OK... Googling around I guess I've found the response to my question. I've done this and then radeonHD backlight start to work again.... kroupouk xf86-video-radeonhd # git bisect log git bisect start # bad: [1ff8649877a8d75b2614b40f90da60e3690fc88d] Move test for backlight support enabled to proper place. git bisect bad 1ff8649877a8d75b2614b40f90da60e3690fc88d # bad: [de3f80bc6ec2adaab40912fee92fe5f38564d1fe] Reenabling AtomBIOS controlled backlight. git bisect bad de3f80bc6ec2adaab40912fee92fe5f38564d1fe # good: [a006e56b0b845028780a25d905cd15eb94b34fd6] Remove superfluous function arguments. git bisect good a006e56b0b845028780a25d905cd15eb94b34fd6 so indeed... one of the 2 fixes are causing the issue.
So... Ive done this kroupouk xf86-video-radeonhd # git log kroupouk xf86-video-radeonhd # git branch olly master kroupouk xf86-video-radeonhd # git checkout olly Switched to branch 'olly' kroupouk xf86-video-radeonhd # git revert de3f80bc6ec2adaab40912fee92fe5f38564d1fe Finished one revert. [olly 88cb682] Revert "Reenabling AtomBIOS controlled backlight." 3 files changed, 20 insertions(+), 2 deletions(-) seems the "Reenabling AtomBIOS controlled backlight" is guilty here
Just upgraded to 4758ba31d49dbafb1e8c9e19aad84d41183c7f19 [Add ACPI controlled Backlight support for Linux.] and now the issue is solved. I think you should close this bug,
Does this issue occur with the preferred ati driver (xf86-vide-ati)? If so, please move this to the Driver/Radeon component. Development of radeonhd has pretty much halted and development focus is on the ati driver. Please see http://www.x.org/wiki/radeonhd If the issue does not exist in the ati driver (or if there is no response to this message), this bug will be closed as WONTFIX unless someone contributes a patch.
I dont have any ATI cards any more :-) I would say close this old bug
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