On 25.10.2015 04:25, Michael Burian wrote: > hi, > > after updating the kernel from linux-stable[0] v4.2.3 to v4.2.4 on my > hp compaq nx9420 laptop (Debian Jessie, amd64), the backlight is turned off > within the first couple of seconds during boot. > > The situation persists (Xorg seems to be running fine, icons can be recognized > by illuminating the screen with a flashlight) until reboot using an earlier > kernel. > > current mainline[1] as of now (4.3.0-rc6-00277-g01815536) is also affected > > Workaround: use earlier kernel (v4.2.3) or (see below) > > Hardware: > > lspci | grep adeo > 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] > RV530/M56-P [Mobility Radeon X1600] > > git bisect log > # bad: [190bd21bba09ed476d9359d3e8be20e8d9dcd8a4] Linux 4.2.4 > # good: [fcba09f2b0bf27eeaa1d4d439edb649585f35040] Linux 4.2.3 > git bisect start 'v4.2.4' 'v4.2.3' 'drivers/gpu/' > # good: [885838eef785ff810dac945be8132856f2113cf1] drm/amdgpu: make UVD > handle checking more strict > git bisect good 885838eef785ff810dac945be8132856f2113cf1 > # good: [230f6fd628c83fcb44ea364d69a9ad88826ef8c4] drm/i915/bios: handle MIPI > Sequence Block v3+ gracefully > git bisect good 230f6fd628c83fcb44ea364d69a9ad88826ef8c4 > # bad: [5a633828b4b2bef343826afcb0a70770c4911c55] drm/radeon: Restore LCD > backlight level on resume (>= R5xx) > git bisect bad 5a633828b4b2bef343826afcb0a70770c4911c55 > # good: [60a09aef456ef590762d47da9c25650e230e2f85] drm: Reject DRI1 hw lock > ioctl functions for kms drivers > git bisect good 60a09aef456ef590762d47da9c25650e230e2f85 > # first bad commit: [5a633828b4b2bef343826afcb0a70770c4911c55] drm/radeon: > Restore LCD backlight level on resume (>= R5xx) > > Workaround 2: > > reverting this single commit 5a633828b4b2bef343826afcb0a70770c4911c55 fixes > the problem in linux-stable[0] > as well as mainline[1] 4.3.0-rc6-00277-g01815536
Please provide the dmesg output from running with the attached debugging patch. Alex, any other ideas what might go wrong? -- Earthling Michel Dänzer | http://www.amd.com Libre software enthusiast | Mesa and X developer -------------- next part -------------- A non-text attachment was scrubbed... Name: radeon-bl-debug.diff Type: text/x-patch Size: 2424 bytes Desc: not available URL: <http://lists.freedesktop.org/archives/dri-devel/attachments/20151026/8c1b157d/attachment.bin>
