[bug #54511] grub2.02 fails to start VBE videomodes on Intel Atom Z36xxx/Z37xxx Series Graphics & Display in CSM mode

[Nikolai]

URL:
  <http://savannah.gnu.org/bugs/?54511>

                 Summary: grub2.02 fails to start VBE videomodes on Intel Atom
Z36xxx/Z37xxx Series Graphics & Display in CSM mode
                 Project: GNU GRUB
            Submitted by: nickel
            Submitted on: Tue 14 Aug 2018 07:19:02 AM UTC
                Category: User Interface
                Severity: Major
                Priority: 5 - Normal
              Item Group: Hardware-specific
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: Nikolai
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: 2.02
         Reproducibility: Every Time
         Planned Release: None

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Details:

Nettop PC based on Intel Celeron J1800 CPU provides CSM (compatibility support
mode).

GRUB 2.02 VBE video driver module fails to init any resolution videomode
(800x600 in particular) in above mentioned mode.
VGA module falls back to 640x480x8, and background picture is poorly
displayed.

Only videotest 640x480 shows test picture when only VGA module loaded. 

In the same time extlinux boot loader starts VBE mode properly (please refer
to attached pictures).

Issue may be similar to earlier reported bug #50911
<https://savannah.gnu.org/bugs/index.php?50911>

lspci output for VGA adapter:

00:02.0 VGA compatible controller: Intel Corporation Atom Processor
Z36xxx/Z37xxx Series Graphics & Display (rev 0e)


xrandr output:

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
VGA-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y
axis) 521mm x 293mm
   1920x1080     60.00*+
   1680x1050     59.95  
   1280x1024     75.02    60.02  
   1440x900      59.89  
   1280x960      60.00  
   1280x720      60.00  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   640x480       75.00    72.81    66.67    59.94  
   720x400       70.08  
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)






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File Attachments:


-------------------------------------------------------
Date: Tue 14 Aug 2018 07:19:02 AM UTC  Name: cpuinfo_output  Size: 2KiB   By:
nickel

<http://savannah.gnu.org/bugs/download.php?file_id=44777>
-------------------------------------------------------
Date: Tue 14 Aug 2018 07:19:02 AM UTC  Name: grub-2.02-menu.jpg  Size: 96KiB  
By: nickel

<http://savannah.gnu.org/bugs/download.php?file_id=44778>
-------------------------------------------------------
Date: Tue 14 Aug 2018 07:19:02 AM UTC  Name: extlinux-menu.jpg  Size: 96KiB  
By: nickel

<http://savannah.gnu.org/bugs/download.php?file_id=44779>
-------------------------------------------------------
Date: Tue 14 Aug 2018 07:19:02 AM UTC  Name: gfxmode_800x600.jpg  Size: 138KiB
  By: nickel

<http://savannah.gnu.org/bugs/download.php?file_id=44780>

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