Did you try the options in:
File Manager PCManFM > Edit > Preferences > Volume Management > Auto-mount
Unlike all previous versions, 7.6 doesn't automatically mount CDs. I have to type "mount /media/sr0".
Did you try the options in:
File Manager PCManFM > Edit > Preferences > Volume Management > Auto-mount
That doesn't help.
Ok, found the problem. You have to add kernel option:
block.events_dfl_poll_msecs=1000
Looks like a strange command to me but if it works ...
Looks to me like more Linux gibberish. Sure, Linux experts enjoy saying to noobs "you just have to add a kernel option". It certainly demonstrates their superiority and better understanding. But many average users have no idea exactly how you "add a kernel option". It isn't hard to understand why Linux is still marginalized on the desktop.
---
Verifying of md5 checksum and burning a CD at slow speed are important.
At least it's an easy fix, just add it to syslinux.cfg (assuming your knoppix is on a USB stick).
My Knoppix 7.7.0 is a LiveUSB on a Dell Inspiron which has a r/w cd/dvd drive in it.
This implies legacy boot and a remote possibility of systemd messing with things.
I was surprised that cds were not always being recognized, along with other media.
However, I finally noted that, for my set-up anyway, a cd physically in place
in the cd drive reader during boot will be recognized, whereas a cd added after boot
will not be recognized.
So, one work-around for Knoppix 7.7.0 LiveUSB legacy boot users is simply just to
re-boot with the cd in place. I would not be surprised that this problem and work-
around might apply to earlier Knoppix LiveUSBs as well, but I haven't checked this out.
Fanxiang 4TB 2TB 1TB SSD 550MB/s 2.5'' SATA III Internal Solid State Drive lot
$188.99
Netac 2TB 1TB 512GB 240GB Internal SSD 2.5'' SATAIII 6Gb/s Solid State Drive lot
$108.99
Fanxiang SSD 4TB 2TB 1TB 512GB 2.5''SATA III Internal Solid State Hard Drive LOT
$188.09
Netac 1TB 2TB 512GB Internal SSD 2.5'' SATA III 6Gb/s Solid State Drive lot
$109.99
Patriot P210 128GB 256GB 512GB 1TB 2TB 2.5" SATA 3 6GB/s Internal SSD PC/MAC Lot
$13.99
Crucial MX500 CT250MX500SSD1 250 GB SATA III 2.5 in Solid State Drive
$14.99
WD BLUE 3D NAND 250GB 2.5" SATA Laptop SSD Solid State Tested,Wiped -WDS250G2B0A
$14.44
(USED) Verbatim 512GB SATA/600 2.5" Internal Solid State Drive Vi550 S3
$22.95
4 TB SSD SATA III Drive 2.5" Solid State Drive SATAIII 6Gb/s UP to 540MB/s
$149.00
Kingshark MSATA 128GB 256gb 512GB 1TB SSD Internal Laptop Solid State Drive Lot
$179.99