以前在同一系统上，HP 打印机与 acroread 配合使用时运行良好，但现在使用 acroread 时停止工作。
Gentoo 稳定版，运行 3.18.11。
打印机：通过以太网连接的 HP Officejet Pro 8100
HPLIP：net-print/hplip-3.14.10
我可以从 Firefox 和命令行打印，例如使用：
echo "hello" | lpr
但是，从 acroread 打印却失败了。
在 /var/log/cups/access_log 中我只看到良性消息：
localhost - - [03/May/2015:14:49:07 +0200] "POST /printers/Officejet_Pro_8100 HTTP/1.1" 200 506 Create-Job successful-ok
localhost - - [03/May/2015:14:49:07 +0200] "POST /printers/Officejet_Pro_8100 HTTP/1.1" 200 209178 Send-Document successful-ok
对于 localhost:631 的 CUPS 也同样如此，没有错误表明存在任何问题。
对于 hplip 包含的基于 GUI 的工具来说也是如此，它显示打印机已收到作业并且处于“打印”状态，只是没有进行物理打印。
hplip 的使用标志：
* Found these USE flags for net-print/hplip-3.14.10:
U I
+ + X : Enables scanner GUI dependencies with USE="scanner" where media-gfx/xsane is preferred over media-gfx/sane-frontends
+ + doc : Build documentation
- - fax : Enable fax on multifunction devices which support it
+ + hpcups : Build the hpcups driver for cups (by HP)
+ + hpijs : Build the IJS driver for cups (Foomatic)
- - kde : Enables kde-misc/skanlite as scanner GUI with USE="scanner X"
+ + libnotify : Enables desktop notifications
- - libusb0 : Depend on virtual/libusb:0. Some old printers do not work with virtual/libusb:1
- - minimal : Only build internal hpijs/hpcups driver (not recommended at all, make sure you know what you are doing)
- - parport : Enable parallel port for devices which require it
+ + policykit : Enable PolicyKit authentication support
+ + python_targets_python2_7 : Build with Python 2.7
+ + qt4 : Enable graphical interface using Qt 4
- - scanner : Enable scanner on multifunction devices which support it
+ + snmp : Add support for net-analyzer/net-snmp which enables this driver to work over networks (both for server and client)
- - static-ppds : Use statically-generated PPDs instead of Dynamic PPDs. Although this is deprecated some printers may still need it
to work properly. Use this flag if hp-setup fails to find/create a valid PPD file
acroread 使用标志：
+ + html : HTML support and help reading capability (only for x86).
+ + ldap : Add LDAP support (Lightweight Directory Access Protocol)
- - linguas_ja : Japanese locale
- - linguas_ko : Korean locale
- - linguas_zh_CN : Chinese locale for Peoples Republic of China
- - linguas_zh_TW : Chinese locale for Taiwan
+ + nsplugin : Build plugin for browsers supporting the Netscape plugin architecture (that is almost any modern browser)
hp-doctor 显示以下错误，但请注意，这些错误自打印机工作以来一直存在，我怀疑它们是否相关：
error: avahi-utils avahi-utils OPTIONAL - - MISSING 'avahi-utils needs to be installed'
error: reportlab Python-PDF-Lib OPTIONAL 2.0 - MISSING 'reportlab needs to be installed'
error: pil Python-Image-Lib OPTIONAL - - MISSING 'pil needs to be installed'
我已尝试过：
物理地打开和关闭打印机。使用另一台也运行 Gentoo 的计算机（结果相同，可以工作，但不能与 acroread 配合使用）。将 hpijs USE 标志添加到 hplip（以前不需要，现在似乎没什么区别）。
为什么这不起作用？是 acroread 的问题，还是 hplip 的问题，还是物理打印机的软件问题？