[Qemu-devel] [Bug 1374905] [NEW] Pixelation issue in 16-bit color VGA graphics

[Alex]

Public bug reported:

What happened:
I ran the 9front installation ISO (here: 
http://r-36.net/9front/9front-3853.02ebd469f43a.iso.bz2) in QEMU, with a blank 
qcow2, using `qemu-system-i386 -hda 9front.qcow2.img -cdrom 
9front-3853.02ebd469f43a.iso -boot d -vga std -m 1G`. During the console boot, 
I accept the default display settings (1024x768x16, VESA, PS2 mouse), and 
9front proceeds to the GUI boot. However, every pixel is blurred, making text 
illegible and the GUI unusable.

What I expected:
Normal pixel rendering / normal display.

Step by step instructions:
0. Install QEMU 2.1.2 (I use Homebrew's bottle, `brew install qemu`)
1. Download 9front ISO (9front-3853.02ebd469f43a.iso.bz2)
2. Create new QEMU image: `qemu-img create -f qcow2 9front.qcow2.img 20G`.
3. Boot 9front ISO: `qemu-system-i386 -hda 9front.qcow2.img -cdrom 
9front-3853.02ebd469f43a.iso -boot d -vga std -m 1G`
4. It displays a console boot screen; accept default args (local, glenda, 
1024x768x16, vesa, ps2, etc...)
5. GUI is drawn.
6. Pixel are blurred and unreadable

Details:
This bug does not occur when 32 bit color is used, using the 1024x768x32. This 
bug does not occur when QEMU is built with SDL (in Homebrew, `brew install qemu 
--with-sdl`), although the console portion of 9front's boot runs significantly 
slower.

System:
OS X 10.9.5 x86-64
Macbook Retina Late 2012
Intel i7 Ivy Bridge dual core.

Build:
Homebrew's QEMU 2.1.2 bottle, which is build without GTK, SDL, or VDE.

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "Screenshot of buggy rendering."
   
https://bugs.launchpad.net/bugs/1374905/+attachment/4217897/+files/Screen%20Shot%202014-09-27%20at%203.59.54%20AM.png

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https://bugs.launchpad.net/bugs/1374905

Title:
  Pixelation issue in 16-bit color VGA graphics

Status in QEMU:
  New

Bug description:
  What happened:
  I ran the 9front installation ISO (here: 
http://r-36.net/9front/9front-3853.02ebd469f43a.iso.bz2) in QEMU, with a blank 
qcow2, using `qemu-system-i386 -hda 9front.qcow2.img -cdrom 
9front-3853.02ebd469f43a.iso -boot d -vga std -m 1G`. During the console boot, 
I accept the default display settings (1024x768x16, VESA, PS2 mouse), and 
9front proceeds to the GUI boot. However, every pixel is blurred, making text 
illegible and the GUI unusable.

  What I expected:
  Normal pixel rendering / normal display.

  Step by step instructions:
  0. Install QEMU 2.1.2 (I use Homebrew's bottle, `brew install qemu`)
  1. Download 9front ISO (9front-3853.02ebd469f43a.iso.bz2)
  2. Create new QEMU image: `qemu-img create -f qcow2 9front.qcow2.img 20G`.
  3. Boot 9front ISO: `qemu-system-i386 -hda 9front.qcow2.img -cdrom 
9front-3853.02ebd469f43a.iso -boot d -vga std -m 1G`
  4. It displays a console boot screen; accept default args (local, glenda, 
1024x768x16, vesa, ps2, etc...)
  5. GUI is drawn.
  6. Pixel are blurred and unreadable

  Details:
  This bug does not occur when 32 bit color is used, using the 1024x768x32. 
This bug does not occur when QEMU is built with SDL (in Homebrew, `brew install 
qemu --with-sdl`), although the console portion of 9front's boot runs 
significantly slower.

  System:
  OS X 10.9.5 x86-64
  Macbook Retina Late 2012
  Intel i7 Ivy Bridge dual core.

  Build:
  Homebrew's QEMU 2.1.2 bottle, which is build without GTK, SDL, or VDE.

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