Re: gfxmode=auto. how is resolution calculated?

[Carrot Cruncher]

the laptop i have has a full hd screen. i'll get the vbeinfo info but for now here is some further info :

xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
LVDS-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 408mm x 230mm
   1920x1080      60.0*+   60.0  
   1680x1050      60.0  
   1400x1050      60.0  
   1280x1024      59.9  
   1280x960       59.9  
   1152x864       60.0  
   1024x768       59.9  
   800x600        59.9  
   640x480        59.4  
   720x400        59.6  
   640x400        60.0  
   640x350        59.8  
VGA-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)

cat /sys/devices/pci0000:00/0000:00:03.0/0000:01:00.0/drm/card0/card0-LVDS-1/edid | edid-decode 
Extracted contents:
header:          00 ff ff ff ff ff ff 00
serial number:   0d af 00 18 00 00 00 00 28 12
version:         01 03
basic params:    80 29 17 78 0a
chroma info:     cc b5 a7 54 45 97 26 16 50 54
established:     00 00 00
standard:        01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
descriptor 1:    29 36 80 a0 70 38 1f 40 30 20 35 00 98 e6 10 00 00 18
descriptor 2:    00 00 00 fe 00 4e 31 38 34 48 34 2d 4c 30 31 0a 20 20
descriptor 3:    00 00 00 fe 00 43 4d 4f 0a 20 20 20 20 20 20 20 20 20
descriptor 4:    00 00 00 fe 00 4e 31 38 34 48 34 2d 4c 30 31 0a 20 20
extensions:      00
checksum:        a0

Manufacturer: CMO Model 1800 Serial Number 0
Made week 40 of 2008
EDID version: 1.3
Digital display
Maximum image size: 41 cm x 23 cm
Gamma: 2.20
Supported color formats: RGB 4:4:4, YCrCb 4:2:2
First detailed timing is preferred timing
Established timings supported:
Standard timings supported:
Detailed mode: Clock 138.650 MHz, 408 mm x 230 mm
               1920 1968 2000 2080 hborder 0
               1080 1083 1088 1111 vborder 0
               -hsync -vsync
ASCII string: N184H4-L01
  ASCII string: CMO
         ASCII string: N184H4-L01
  Checksum: 0xa0
EDID block does NOT conform to EDID 1.3!
    Missing name descriptor
    Missing monitor ranges

this is a fedora 18 system with the following grub package installed :

grub2-2.00-15.fc18.x86_64

On Fri, Mar 15, 2013 at 11:47 PM, Jordan Uggla <address@hidden> wrote:

On Fri, Mar 15, 2013 at 2:57 PM, Carrot Cruncher
<address@hidden> wrote:
> hi. can i ask how the resolution used is calculated when setting the gfxmode
> setting to auto in grub2. i have a laptop where vbeinfo shows the highest

In grub 2.00 I believe that what is used is the highest resolution
supported by VBE (or GOP,UGA, or whatever interface is available) that
is *also* supported by your monitor, as reported in the monitor's EDID
information.

> resolution as being 1920x1080x32 but this isn't what is being used. without

Does your monitor support this resolution?

> hardcoding the resolution, is there a way to configure grub2 to use the
> highest resolution detected? thanks.

Well clearly that is what should already happen when gfxmode=auto, so
we need to figure out why that apparently isn't happening for you,
then go from there.

What version of grub are you using?
Could you post the full output of "videoinfo" from the grub shell,
either via a picture from a camera, serial log, or (if you're really
ambitious) typing it out manually?

--
Jordan Uggla (Jordan_U on irc.freenode.net)