One problem related to vesa_drv when compiling

[王硕]

Dear Norman and all,

I encountered a problem when compiling, and I didn't find similar problems and solution on the Web throughout the day.
Ubuntu 14.08  64-bit, Genode 13.02, VGA compatible controller‍: Advanced Micro Devices, Inc. [AMD/ATI] Caicos XT [Radeon HD 7470/8470 / R5 235 OEM]‍ (should be 7470)

When I compiling make run/sth with GUI, vesa_drv failed to detect the VBE:
[init -> vesa_drv] Could not open file "config"
[init -> vesa_drv] Could not obtain config file
[init -> vesa_drv] VBE Bios not present
[init -> vesa_drv] Could not set vesa mode 1024x768 at ...64...
[init -> nitpicker] C++ runtime: Genode::Parent::Service_denied
[init -> nitpicker] void* abort(): abort called
‍

as "dmesg | grep vesa‍" indicated:
[    0.610537] vesafb: mode is 1400x1050x32, linelength=5632, pages=0
[    0.610538] vesafb: scrolling: redraw
[    0.610539] vesafb: Truecolor: size=0:8:8:8, shift=0:16:8:0
[    0.610795] vesafb: framebuffer at 0xe0000000, mapped to 0xf8480000, using 5824k, total 5824k
‍

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 Shuo Wang, 
University of Chinese Academy of Sciences.
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