fix widescreen resolution issues

hi,

the attached patch fixes the issues with widescreen resolutions for me when using -std-vga.

in vgabios/vbetables-gen.c I changed the video memory from 8MB to 16MB which is sufficient for resolutions up to 2560x1600. I've also added some more video modes (up to 2560x1600) with 16, 24, 32bit color depth each and I've removed the duplicate for the 1280x960 mode.

in qemu/hw/vga_int.h I've adapted the maximum resolution accordingly.

you can download the updated vgabios from http://www.wina.at/vgabios.bin

I would appreciate any suggestions, comments and of course testing.

@Arne Brutschy: could you please test the 1920x1200 resolution with your setup?

cheers,
Andi

@@ -2,7 +2,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 
-#define VBE_DISPI_TOTAL_VIDEO_MEMORY_MB 8
+#define VBE_DISPI_TOTAL_VIDEO_MEMORY_MB 16
 
 typedef struct {
     int width;

@@ -55,18 +55,27 @@
 { 1152, 864, 16                      , 0x14a},
 { 1152, 864, 24                      , 0x14b},
 { 1152, 864, 32                      , 0x14c},
-{ 1280, 800, 24                      , 0x178},
-{ 1280, 800, 32                      , 0x179},
-{ 1280, 960, 24                      , 0x180},
-{ 1280, 960, 32                      , 0x181},
-{ 1280, 960, 24                      , 0x182},
-{ 1280, 960, 32                      , 0x183},
-{ 1440, 900, 24                      , 0x184},
-{ 1440, 900, 32                      , 0x185},
-{ 1400, 1050, 24                     , 0x186},
-{ 1400, 1050, 32                     , 0x187},
-{ 1680, 1050, 24                     , 0x188},
-{ 1680, 1050, 32                     , 0x189},
+{ 1280, 800, 16                      , 0x178},
+{ 1280, 800, 24                      , 0x179},
+{ 1280, 800, 32                      , 0x17a},
+{ 1280, 960, 16                      , 0x17b},
+{ 1280, 960, 24                      , 0x17c},
+{ 1280, 960, 32                      , 0x17d},
+{ 1440, 900, 16                      , 0x17e},
+{ 1440, 900, 24                      , 0x17f},
+{ 1440, 900, 32                      , 0x180},
+{ 1400, 1050, 16                     , 0x181},
+{ 1400, 1050, 24                     , 0x182},
+{ 1400, 1050, 32                     , 0x183},
+{ 1680, 1050, 16                     , 0x184},
+{ 1680, 1050, 24                     , 0x185},
+{ 1680, 1050, 32                     , 0x186},
+{ 1920, 1200, 16                     , 0x187},
+{ 1920, 1200, 24                     , 0x188},
+{ 1920, 1200, 32                     , 0x189},
+{ 2560, 1600, 16                     , 0x18a},
+{ 2560, 1600, 24                     , 0x18b},
+{ 2560, 1600, 32                     , 0x18c},
 { 0, },
 };
 

@@ -30,8 +30,8 @@
 /* bochs VBE support */
 #define CONFIG_BOCHS_VBE
 
-#define VBE_DISPI_MAX_XRES              1600
-#define VBE_DISPI_MAX_YRES              1200
+#define VBE_DISPI_MAX_XRES              2560
+#define VBE_DISPI_MAX_YRES              1600
 #define VBE_DISPI_MAX_BPP               32
 
 #define VBE_DISPI_INDEX_ID              0x0

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What about VGA_RAM_SIZE in qemu/hw/pc.h?

error compiling committee.c: too many arguments to function


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D'oh. Must have missed it. :\ Thanks! Unfortunately, it still does not work. Qemu crashes now as windows switches to graphics mode. Safe mode does not work either..

Arne

Arne Brutschy
Ph.D. Student                    Email    arne.brutschy(AT)ulb.ac.be
IRIDIA CP 194/6                  Web      iridia.ulb.ac.be/~abrutschy
Universite' Libre de Bruxelles   Tel      +32 2 650 2729
Avenue Franklin Roosevelt 50     Fax      +32 2 650 2715
1050 Bruxelles, Belgium          (Tel and Fax both IRIDIA secretary)


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hi,

For now I'd suggest trying the following:

* download the latest qemu cvs snapshot

qemu

* apply the patch for hw/vga_int.h and change VGA_RAM_SIZE in hw/pc.h to 16 * 1024 * 1024 (16MB)

* configure, make and install qemu

you like)

# make install (as root)

* download, configure, make and install kqemu (optional, but highly suggested)

# make install (as root)

* copy the modified vgabios.bin to the qemu dir

# cp vgabios.bin /usr/local/qemu-cvs/share/qemu (as root; change to 
target path according to the prefix you used above)

* start your vm image as usual, but use /usr/local/qemu-cvs/bin/qemu instead of qemu/kvm.

if kqemu does not work, reading the documentation
http://fabrice.bellard.free.fr/qemu/kqemu-doc.html
might help.

Please test it that way. If it works, it should be possible to make it working with kvm as well.

cheers,
Andi

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hi,

I'm guess I've uploaded to wrong vgabios.bin, so if you don't want to compile it yourself and don't have those high resolution modes available, then you can get the vgabios.bin file from

http://www.wina.at/vgabios.bin

resolutions up to 2560x1600 should be available (although they do not neccessarily work).

cheers,
Andi

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hi,

I already tried changing the VGA_RAM_SIZE value in pc.h to 16 * 1024 * 1024 (16MB), but then kvm crashes when the guest os switches to graphics mode.

Changing VGA_RAM_SIZE in pc.h to 16MB works when I use the latest cvs snapshot of qemu (didn't test it with qemu-0.9.1 release version).

Unfortunately I am not experienced in debugging kvm or qemu, so I hope someone can find out what's going on in this case.

cheers,
Andi

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Hi,

Thanks for the patch, Andreas! You found the "magic limitation" to 1600x1200...

I did, it does not work. :( I can select the video mode, but upon activation qemu crashes. I think the video memory overwrites system memory because qemu does not allocate the increased vmem properly. So every mode under 8MB of video ram does work, all others do not.

1680x1050x32 => works (7056000 bytes)
1920x1200x24 => works (6912000 bytes)
1920x1200x32 => crashes (9216000 bytes)

I haven't found the piece of code that's responsible for vmem allocation yet. Does somebody know where this is done? Is there somebody from qemu reading this?

Arne

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there is a DEFINE name VGA_RAM_SIZE or something like that

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