Troubleshooting LVDS on GM45 (kernel 4.5.0)

2016-04-05 Thread Rob Kramer
On 04/04/2016 10:58 PM, Ville Syrjälä wrote: > >> Since this VBT mode is probably junk anyway, I commented out the >> if-statement that selects it (in intel_lvds.c), so that the code will >> pick the mode as set by BIOS. The result is much better, I actually get >> proper looking output! X also

Troubleshooting LVDS on GM45 (kernel 4.5.0)

2016-04-04 Thread Ville Syrjälä
On Mon, Apr 04, 2016 at 11:14:45AM +0800, Rob Kramer wrote: > I've tried again without video parameter -- same outcome. I've also > applied Ville's patch "drm/i915: Read timings from the correct > transcoder in intel_crtc_mode_get()" (with teeny backport fix). It seems > this code is never

Troubleshooting LVDS on GM45 (kernel 4.5.0)

2016-04-04 Thread Rob Kramer
I've tried again without video parameter -- same outcome. I've also applied Ville's patch "drm/i915: Read timings from the correct transcoder in intel_crtc_mode_get()" (with teeny backport fix). It seems this code is never called in my case though, since intel_lvds_init() chooses to use the

Troubleshooting LVDS on GM45 (kernel 4.5.0)

2016-04-01 Thread Rob Kramer
Here's the same issue on a more reasonable kernel. The log looks quite different, but the end result is still a blank screen. Uploaded here: http://pastebin.com/WLpT5mPc This section looks promising: [4.763951] [drm:intel_dump_pipe_config] requested mode: [4.763953]

Troubleshooting LVDS on GM45 (kernel 4.5.0)

2016-04-01 Thread Jani Nikula
On Fri, 01 Apr 2016, Rob Kramer wrote: > Here's the same issue on a more reasonable kernel. The log looks quite > different, but the end result is still a blank screen. Uploaded here: > http://pastebin.com/WLpT5mPc > > This section looks promising: > > [4.763951]