On 17/12/2015 04:41, Scott Alfter wrote:
On 2015-12-16 19:18, m. allan noah wrote:
You found the patch. If removing that fixes the issue, then our
workaround is causing problems with current linux kernels. I suppose
we will have to make the workaround controlled by an environment
variable in that case.
It didn't fix it when using gentoo-sources (kernel) 4.1.12, but in
combination with gentoo-sources 4.3.3, I have only had one failure to
scan, and that was when I told it to try scanning at 4800 dpi. At
normal settings (600 dpi and below), I suspect it'll scan all day. It
even completed a scan at 2400 dpi after a bit of a delay.
I then put the patch back in (or, more precisely, didn't patch it
out), recompiled, and tried again under the newer kernel. It seems to
be running about the same with the workaround as without: an "invalid
argument" error at 4800 dpi, but it works at 2400 dpi and below.
The patch doesn't appear to be making much of a difference one way or
the other. Instead, it would appear the kernel developers may have
fixed whatever was broken with USB 3.0 support somewhere between
4.1.12 and 4.3.3.
Hello,
before scanning, the scanner calibrates itself. The higher the
resolution, the longer the calibration takes. The calibration data is
then cached , and subsequent scans are faster. That explains the delay
you saw at 2400 dpi.
For the 4800 dpi scan, what is the scan area used (width, height) ?
Regards,
Stef
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