xen启动时vga的配置

Accoding suse xen book:

TIP: Graphics Problems

Sometimes it may happen that the graphics system does not work properly. In
this case, add vga=ask to the boot parameters. To activate permanent settings,
use vga=mode-0x??? where ??? is calculated as 0x100 + VESA mode from

e.g.vga=mode-0x361.

从上述链接知道了在suse linux下面查询硬件信息的方法：

hwinfo --all

其中hwinfo --framebuffer 可查在文本界面下的分辨率列表

SLES11:~/Desktop # hwinfo --framebuffer
02: None 00.0: 11001 VESA Framebuffer
[Created at bios.464]
Unique ID: rdCR.fRULN9k9OD4
Hardware Class: framebuffer
Model: "Intel(r)Cantiga Graphics Controller"
Vendor: "Intel Corporation"
Device: "Intel(r)Cantiga Graphics Controller"
SubVendor: "Intel(r)Cantiga Graphics Chip Accelerated VGA BIOS"
SubDevice:
Revision: "Hardware Version 0.0"
Memory Size: 31 MB + 960 kB
Memory Range: 0xd0000000-0xd1feffff (rw)
Mode 0x0360: 768x480 (+768), 8 bits
Mode 0x0361: 768x480 (+1536), 16 bits
Mode 0x0362: 768x480 (+3072), 24 bits
Mode 0x0363: 960x600 (+960), 8 bits
Mode 0x0364: 960x600 (+1920), 16 bits
Mode 0x0365: 960x600 (+3840), 24 bits
Mode 0x0366: 1280x800 (+1280), 8 bits
Mode 0x0367: 1280x800 (+2560), 16 bits
Mode 0x0368: 1280x800 (+5120), 24 bits
Mode 0x0305: 1024x768 (+1024), 8 bits
Mode 0x0317: 1024x768 (+2048), 16 bits
Mode 0x0318: 1024x768 (+4096), 24 bits
Mode 0x0312: 640x480 (+2560), 24 bits
Mode 0x0314: 800x600 (+1600), 16 bits
Mode 0x0315: 800x600 (+3200), 24 bits
Mode 0x0301: 640x480 (+640), 8 bits
Mode 0x0303: 800x600 (+832), 8 bits
Mode 0x0311: 640x480 (+1280), 16 bits
Config Status: cfg=new, avail=yes, need=no, active=unknown

title Xen -- SUSE Linux Enterprise Server 11 - 2.6.27.19-5
root (hd0,7)
kernel /boot/xen.gz crashkernel=128M@16M vga=mode-9
module /boot/vmlinuz-2.6.27.19-5-xen root=/dev/disk/by-id/ata-FUJITSU_MHZ2250BH_G2_K60KT8425MD8-part8 resume=/dev/disk/by-id/ata-FUJITSU_MHZ2250BH_G2_K60KT8425MD8-part9 showopts
module /boot/initrd-2.6.27.19-5-xen

尝试了一下：

1.在第一个module 行末尾处加上 vga=0x368  ，不行

2.在kernel这一行加上vga=0x368,也不行 

3.在kernel 这一行加上vga=ask ， 出现一个列表 ，选择第9个， boot后可以了，有效果， 

但不能老是在启动的过程中去选择阿，修改为vga=mode-0x368 ，boot后没效果，修改为vga=mode-0x468，也没效果

4.最后干脆 vga=mode-9 ，boot 有效果 

成功了，纯粹了是碰出来的，事先没有google, 看来解决问题有时候要合理的猜想，尝试！

后来查了一下，也没有vga=mode-N0 的这种方式，奇怪，改天看看xen 源码，先记录一下！

Xen’s graphical video mode codes are different from Linux Kernel’s. This is a list of Xen’s vga option from [1]:
'vga=[,keep]' where is one of:

'vga=ask':
display a vga menu of available modes

'vga=text-80x':
text mode, where is one of {25,28,30,34,43,50,60}

'vga=gfx-xx':
graphics mode, e.g., vga=gfx-1024x768x16

'vga=mode-:
specifies a mode as specified in 'vga=ask' menu
(NB. menu modes are displayed in hex, so mode numbers here must
be prefixed with '0x' (e.g., 'vga=mode-0x0318'))

The option 'keep' causes Xen to continue to print to the VGA console even
after domain 0 starts to boot. The default behaviour is to relinquish
control of the console to domain 0.