Re: X server does not start after upgrading to Debian 10

[Felix Miata <mrmazda@earthlink.net>]

Teemu Likonen composed on 2019-07-07 15:13 (UTC+0300):

> Solved. The X server chooses automatically some wrong graphics module
> ("modeset" I guess). If I force it to use "intel" module the X server
> works again. 
The Intel DDX hasn't had an official release since five years ago:
https://cgit.freedesktop.org/xorg/driver/xf86-video-intel/

Intel pays its driver writers to focus on the modesetting DDX. I only use the
modesetting DDX on Intel Graphics new enough for modesetting DDX support:

# inxi -GxxS
System:    Host: ab250 Kernel: 4.19.0-5-amd64 x86_64 bits: 64 compiler: gcc v: 8.3.0 Desktop: Trinity R14.0.7 tk: Qt 3.5.0 
           wm: Twin dm: TDM Distro: Debian GNU/Linux 10 (buster) 
Graphics:  Device-1: Intel HD Graphics 630 vendor: ASUSTeK driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:5912 
           Display: x11 server: X.Org 1.20.4 driver: modesetting unloaded: fbdev,vesa resolution: 2560x1440~60Hz 
           OpenGL: renderer: Mesa DRI Intel HD Graphics 630 (Kaby Lake GT2) v: 4.5 Mesa 18.3.6 compat-v: 3.0 
           direct render: Yes 

# inxi -GxxS
System:    Host: gx780 Kernel: 4.19.0-5-amd64 x86_64 bits: 64 compiler: gcc v: 8.3.0 Desktop: Trinity R14.0.7 
           tk: Qt 3.5.0 wm: Twin dm: TDM Distro: Debian GNU/Linux 10 (buster) 
Graphics:  Device-1: Intel 4 Series Integrated Graphics vendor: Dell driver: i915 v: kernel bus ID: 00:02.0 
           chip ID: 8086:2e12 
           Display: x11 server: X.Org 1.20.4 driver: modesetting resolution: 1920x1200~60Hz 
           OpenGL: renderer: Mesa DRI Intel Q45/Q43 v: 2.1 Mesa 18.3.6 direct render: Yes 

# inxi -GxxS
System:    Host: 00srv Kernel: 4.12.14-lp151.28.7-default x86_64 bits: 64 compiler: gcc v: 7.4.0 Console: tty 0 wm: kwin
           dm: N/A Distro: openSUSE Leap 15.1
Graphics:  Device-1: Intel 4th Generation Core Processor Family Integrated Graphics vendor: Micro-Star MSI driver: i915
           v: kernel bus ID: 00:02.0 chip ID: 8086:041e
           Display: server: X.Org 1.20.3 driver: modesetting unloaded: fbdev,vesa alternate: intel resolution: 1920x1200~60Hz
           OpenGL: renderer: Mesa DRI Intel Haswell v: 4.5 Mesa 18.3.2 compat-v: 3.0 direct render: Yes

# inxi -GxxS
System:    Host: big41 Kernel: 4.19.0-5-amd64 x86_64 bits: 64 compiler: gcc v: 8.3.0 Desktop: Trinity R14.0.7 
           tk: Qt 3.5.0 wm: Twin dm: TDM Distro: Debian GNU/Linux 10 (buster) 
Graphics:  Device-1: Intel 4 Series Integrated Graphics vendor: Biostar Microtech Intl Corp driver: i915 v: kernel 
           bus ID: 00:02.0 chip ID: 8086:2e32 
           Display: x11 server: X.Org 1.20.4 driver: modesetting unloaded: fbdev,vesa resolution: 1920x1200~60Hz 
           OpenGL: renderer: Mesa DRI Intel G41 v: 2.1 Mesa 18.3.6 direct render: Yes 

Your need for the deprecated DDX must be specific to your particular
GPU. The one you have ought to be specified in your bug report. The
report might get quicker traction if you announce it to the Intel
developers on their mailing list:
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
https://01.org/linuxgraphics/documentation/how-report-bugs shows the
information they want to see in reports, and where to report.

ISTR your experience is known to upstream, but I get lost trying to
find anything I want in their tracking systems. :-P
-- 
Evolution as taught in public schools is religion, not science.

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/