Created attachment 125766 [details]
dmesg output and error file
I have a black screen on booting.
I boot in recovery mode with option modeset=0, then I remove the module i915, and reload it again with option modeset=1. then the screens turns black but I still can send commands to the terminal. Sometimes it works well so I can go on and start normally.
The system is and HP pro 608 g1 tablet with and intel atom x5-z8500 and hd graphics(CHERRYVIEW)
System architecture: x86_64
Kernel: 4.8.0-rc1-hp+ (lastest drm-intel-nightly)
Linux Distribution: Debian Testing
I've attached dmesg output and /sys/class/drm/card0/error
Created attachment 125812 [details]
dmesg extracted from the tarball
Please remove any modeset=0 parameters, reboot, and grab the dmesg. If this leads to black screen, please try to ssh in or do it blind.
Created attachment 125827 [details]
Dmesg without modeset=0
I've attached three files dmesg_ok.txt when everything runs ok.
dmesg_vblank_timeout.txt and Xorg.0.log when i get black screen but everything else works well so I can get these files through ssh.
Created attachment 128301 [details] [review]
drm/i915/dsi: Do not clear DPOUNIT_CLOCK_GATE_DISABLE from vlv_init_display_clock_gating
I've been seeing this same issue on another cherrytrail tablet. After working on debugging this more or less every evening for about a week, I believe I now have a fix :)
Can you please build a recent kernel with the attached patch and see if that fixes this for you ?
I've build lasted kernel and I have applied the attached patch and it works!
Thanks a lot. You have done a great Job.
Resolving as fixed, it is already merged in drm-tip:
author Hans de Goede <email@example.com> 2016-12-02 14:29:04 (GMT)
committer Ville Syrjälä <firstname.lastname@example.org>
commit 721d484563e1a51ada760089c490cbc47e909756 (patch)
on Jan 17, 2017 at 08:53:17.
(provided by the Example extension).