On Mon, Jun 12, 2017 at 11:24 PM, <south0@tuta.io> wrote:
Hi,
after upgrading Firefox form v45 ESR to v52 ESR, the image quality in the X2Go client dropped considerably. Using the same setup in both cases, I now see "blocks" of JPEG artifacts scattered around the window.
My setup:
- Ubuntu 16.04 LTS i686
Are you really using 32bit?
- X2Go server from stable PPA
- X2Go Qt client in Windows (tested in 7 and 10)
- nx set to link=lan, pack=adaptive-9, the rest as default
Are you also _running_ on a LAN?
- Firefox from Mozilla's builds (https://ftp.mozilla.org/pub/firefox/releases)
I'm untaring Firefox to a dedicated dir and pointing X2Go to execute it. The tests were made with fresh Firefox profiles in both cases, with HW acceleration disabled and rendering by cairo. A major difference is that
How did you disable hw rendering?
Have you tried the firefox (53.0.2 or newer, not an ESR version) that Ubuntu is delivering with the distro? Is it also happening with that version?
Firefox 45 uses GTK2 while Firefox 52 uses GTK3.
The areas with artifacts seem to be placed randomly. Icons next to each other in the chrome may or may not be affected. Multiline paragraphs are sometimes divided across the upper/lower middle of the characters.
If I highlight text around quickly, or zoom in/out, I can make the artifact blocks "jump" to other areas in the viewport. After tweaking the font configs, I managed to get rid of the artifacts consistently in text-only documents by using an aliased font against a solid background. Artifacts in the chrome remain nevertheless.
I suggest to clear the caches on server and client and then retry with a new session. Caches are in ~/.x2go.
If I set the nx pack to rle for instance, the artifacts disappear. I'd still like to know if
- this is a bug or expected behaviour
this is certainly not an expected behaviour.
- I can still use adaptive-9 while getting a constant/reproducible image quality
Well, it should work, it does work here on 64bit.
Let me know if you need more info or sceenshots. Thanks in advance.
Please provide some screenshots as well as some URLs your are seeing the problem with. Also I'd like to know the kind of session you are running: a full desktop environment (which?), a published application, a rootless session? Is your distro uptodate? In a broken session please post the options file from the server side (~/.x2go/C-*/options).
Uli