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ikrabbe / plan9front

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9front GUI text is blurred in qemu #211

Closed GoogleCodeExporter closed 9 years ago

GoogleCodeExporter commented 9 years ago 
What happened:
I wanted to test 9front, so I downloaded the most recent ISO 
(9front-3853.02ebd469f43a.iso), created a qcow2 hard drive image, and tried to 
install 9front from the ISO. Once 9front drew the GUI, all the letters were 
blurred.

What was expected:
Legible letters.

Steps to reproduce:
0. Install QEMU (I used Homebrew)
1. Download 9front ISO (9front-3853.02ebd469f43a.iso.bz2)
2. Create QEMU image: `qemu-img create -f qcow2 9front.qcow2.img 20G`
3. Boot 9fron ISO: `qemu -hda 9front.qcow2.img -cdrom ~/iso/9front.iso -boot d 
-vga std -m 768`
4. Accept all defaults (local, 1024x768x16, vesa, ps2, etc)
5. When GUI appears, letters are blurry.

Host system:
OS X 10.9.5 x86-64, Intel i7-3520M.

Original issue reported on code.google.com by alexchan...@gmail.com on 27 Sep 2014 at 8:04

Attachments:

GoogleCodeExporter commented 9 years ago 
hi, i can't reproduce this using the same iso with qemu 1.5.1 or 2.1.0 on 
debian jessie amd64. maybe your qemu version from homebrew is bugged? can you 
try a different version of qemu?

Original comment by mischief@offblast.org on 27 Sep 2014 at 8:32

GoogleCodeExporter commented 9 years ago 
Just upgraded to 2.1.2 from  QEMU 2.1.0.  Still have the same issue. I'm using 
Homebrew's bottled QEMU on OS X (installed with `brew install qemu`).

Also, the command I'm running QEMU with is `qemu-system-i386 -hda 
9front.qcow2.img -cdrom 9front-3853.02ebd469f43a.iso -boot d -vga std -m 1G`

Original comment by alexchan...@gmail.com on 27 Sep 2014 at 10:50

GoogleCodeExporter commented 9 years ago 
Just custom built QEMU 2.1.2 with SDL using `brew install qemu --with-sdl`. The 
pre-GUI boot went really slow, and there was a kernel panic (divide error) as 
soon as the GUI appeared.

It's worth noting this happened once before, when I first tried to run 9front 
on 2.1.0.

Original comment by alexchan...@gmail.com on 27 Sep 2014 at 11:16

Attachments:

GoogleCodeExporter commented 9 years ago 
hi, i tested 9front on qemu on osx. it appears there is a bug with 16 bit 
graphics mode. when the cd prompts you for the resolution, type '1024x768x32' 
for 32 bit depth, instead of the default '1024x768x16'. it worked for me and 
should work for you too. if there is another issue after that, please file a 
seperate ticket.

Original comment by mischief@offblast.org on 27 Sep 2014 at 11:19

GoogleCodeExporter commented 9 years ago 
I killed QEMU and tried again, and made it to the prompt. So it's running 
without blurred text on the QEMU 2.1.2 built with SDL.

Original comment by alexchan...@gmail.com on 27 Sep 2014 at 11:40

Attachments:

GoogleCodeExporter commented 9 years ago 
hi, so you're saying it's a bug in QEMU?

Original comment by alexchan...@gmail.com on 27 Sep 2014 at 11:48

GoogleCodeExporter commented 9 years ago 
the bug could be in qemu, or the libraries qemu uses on OS X. hard to say since 
there is a lot of stuff involved in the graphics stack.

maybe you can try a different emulated graphics card (-vga vmware, qxl, cirrus) 
and see if it just affects the 'std' emulated graphics card.

case closed.

Original comment by mischief@offblast.org on 28 Sep 2014 at 12:10

GoogleCodeExporter commented 9 years ago 
thanks for the panic screenshot. commited patch in rafe936fb2701 avoiding
the division by zero. tsc is probably just wrong on qemu or we'r too fast
and the processors timer interrupts have not fired yet to call accounttime()
which would initialize Mach.perf->period.

Original comment by cinap_le...@felloff.net on 28 Sep 2014 at 12:46

GoogleCodeExporter commented 9 years ago 
Could you note this in the installation FAQ, as a bug in QEMU on OSX?

Original comment by alexchan...@gmail.com on 28 Sep 2014 at 12:52