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 1TB 2TB 512GB Internal SSD 2.5'' SATA III 6Gb/s Solid State Drive lot
$119.99
Samsung 860EVO 500GB 2.5" Laptop SATA Solid State Drive V-NAND SSD Tested, Wiped
$34.99
Fanxiang SSD 4TB 2TB 1TB 512GB SATA SSD 2.5'' III Internal Solid State Drive lot
$108.29
Patriot P210 128GB 256GB 512GB 1TB 2TB 2.5" SATA 3 6GB/s Internal SSD PC/MAC Lot
$19.99
Samsung 250GB 2.5" SATA SSD MZ-76E250, Grade A+, SKU 10368
$19.99
Fanxiang M.2 SATA SSD 2TB 1TB 512GB 256GB SSD Internal M2 Solid State Drive Lot
$21.99
SanDisk 240GB SSD Plus, Internal Solid State Drive - SDSSDA-240G
$16.94
4tb Ssd 870evo Internal Solid State Drive Hard Disk 2.5 Inch Sata SSD For Laptop
$47.79
Netac 2TB 1TB 512GB 240GB Internal SSD 2.5'' SATAIII 6Gb/s Solid State Drive lot
$118.99